This is the truth...
But seriously...
Shade show us the "past", and also the "future"... I mean, what he wants with that? I don't know... The only thing is, he showed you Corey, something that happened before his gym... And then, he shows you Kiki, "predicting" the future, and well... it happens...
I don't know if i can simply assume that what he sowed you is going to happen... But rather, if you character don't do something, what he shows you MIGHT happen... But i don't know...
Also, remember that there's one more PC = The one in the back, where the Rotom is... That's also very interesting...